Patent US3208872A successfully refreshed from Google Patents.
US3208872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbide coatings on graphite
Assignee: Individual
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Filing: 1956-12-31
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Granted: 1965-09-28
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Expires: 1976-12-31
Abstract
No abstract record available.
Inventors
- 👤 Filmore F Criss
- 👤 Wohlberg Cornel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:19
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5053; C04B41/5057; C04B41/80; C04B41/81; C04B41/85; C04B41/87
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
THE METHOD OF COATING THE INSIDE SURFACE OF A GRAPHITE TUBE WITH A METAL CARBIDE COMPRISING THE STEPS OF FILLING THE TUBE CAVITY WITH A METAL OXIDE, CLOSING THE REAR OPENING OF SAID GRAPHITE TUBE AND LIMITING THE SIZE OPENING TO THE FRONT OF SAID TUBE, FILLING A FURNACE WITH INERT GAS, HEATING SAID FURNACE TO AT LEAST THE TEMPERATURE OF DECOMPOSITION OF SAID OXIDE, PASSING SAID TUBE THROUGH SAID FURNACE AT A UNIFORM RATE OF ABOUT 2 INCHES PER MINUTE AND ADJUSTING THE HOT REGION OF SAID FURNACE SO THAT SAID FRONT OPENING OF SAID TUBE IS WITHIN THE HOT REGION OF SAID FURNACE WHEN SAID REAR OPENING OF SAID TUBE ENTERS SAID HOT REGION, SAID OXIDE SELECTD FROM AT LEAST ONE OF THE CLASS CONSISTING OF CB2O5, TA2O5 AND V2O5.
Claim 2
Independent Claim
132 words
THE METHOD OF COATING THE INSIDE SURFACE OF A GRAPHITE TUBE WITH A METAL CARBIDE COMPRISING THE STEPS OF FILLING THE TUBE CAVITY WITH A METAL OXIDE, CLOSING THE REAR OPENING OF SAID GRAPHITE TUBE AND LIMITING THE SIZE OPENING TO THE FRONT OF SAID TUBE, FILLING A FURNACE WITH INERT GAS, HEATING SAID FURNACE TO AT LEAST THE TEMPERATURE OF DECOMPOSITION OF SAID OXIDE, PASSING SAID TUBE THROUGH SAID FURNACE AT A UNIFORM RATE OF ABOUT 2 INCHES PER MINUTE AND ADJUSTING THE HOT REGION OF SAID FURNACE SO THAT SAID FRONT OPENING OF SAID TUBE IS WITHIN THE HOT REGION OF SAID FURNACE WHEN SAID REAR OPENING OF SAID TUBE ENTERS SAID HOT REGION, SAID OXIDE SELECTD FROM AT LEAST ONE OF THE CLASS CONSISTING OF CB2O5, TA2O5 AND V2O5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |